they mostly not
No, China has several hundred nuclear bombs and has had bombs since 1964.
Nuclear bombs are illegal since bombs could potentially be harmful to others and places, so no it is not legal.
No, it is perfectly legal as long as it is used on your own property.
It is illegal for private individuals to prepare bombs of any type. But countries can do what they want to. Ownership of highly enriched Uranium, Uranium-233, or Plutonium by private individuals is illegal in the US and probably several other countries. Without one or the other no nuclear bomb can be built.
I believe no one should use nuclear weapons.
Some bombs are nuclear. But most bombs are not nuclear.
No, only certain ways of testing them and only if a country agrees to the terms of that treaty.
That's not somthing you should now
I'm 99% sure that it's illegal to disclose the process for making nuclear bombs exactly. You're on your own.
Yes, there is nuclear energy in nuclear bombs. It is released in a few microseconds when they are detonated.
Beacause millions of lives were taken by the nuclear bombs
yes, some people research and try to make nuclear bombs in their own houses.